4 years ago

21) -5z – 4 + 8 - x; use x = 7, and z = 2

Mathematics

1 answer:

Ivanshal [37]4 years ago

8 0

Answer:

-13

Step-by-step explanation:

-5z-4+8-x

-5(2)-4+8-7

-10-4+8-7

-14+8-7

-21+8

-13

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2/-7 in standard form

Elan Coil [88]

Answer:

the answer is

x2 - 7 =0

Step-by-step explanation:

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3 years ago

Three security cameras were mounted at the corners of a triangular parking lot. Camera 1 was 156 ft from camera 2, which was 101

Neporo4naja [7]

Answer:

Step-by-step explanation:

Alright, lets get started.

Please refer the diagram I have attached.

Lets use cosine law for finding the angles.

$cosA=\frac{b^2+c^2-a^2}{2bc}$

$cosA=\frac{130^2+156^2-101^2}{2*130*156}$

$cosA=0.7652$

Taking cos inverse

A = 40.08 degrees

Similarly,

$cosB=\frac{a^2+c^2-b^2}{2*a*c}$

$cosB=\frac{101^2+156^2-130^2}{2*156*101}$

$cosB=0.5597$

taking cos inverse

B = 55.97 degrees

Similarly,

$cosC=\frac{a^2 +b^2-c^2}{2ab}$

$cosC=\frac{101^2+130^2-156^2}{2*101*130}$

$cosC=0.1053$

taking cos inverse

C = 83.95 degrees

Means angle C is the largest angles,

So, camera 3 is covering the greatest angle. : Answer

Hope it will help :)

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3 years ago

A 12kg object sits on a horizontal surface.how much force is needed to give the object an acceleration of 4.5m/s?

Bond [772]

Step-by-step explanation:

F net = ma = (12kg)(4.5m/s) = 54N.

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4 years ago

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Answer:

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Step-by-step explanation:

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3 years ago

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True [87]

Red + green = 24; (1)
red + blue = 10; (2)
blue + green = 20; (3)

(1) - (2):
green - blue = 14; (4)

(3) + (4):
2 * green = 34;
green = 17;

Simple substitution gives:
blue = 3;
red = 7;

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3 years ago

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